Malicious PDF — malware analysis report

Static analysis result for SHA-256 1712a2777ca2bae2…

MALICIOUS

PDF

86.8 KB Created: 2021-08-03 05:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f26b949f6ce1100415091e2fe14f899 SHA-1: 90fd0fd3df66d14ad9842e179e712dbae72a9dc7 SHA-256: 1712a2777ca2bae2591ddece1833109fc7c1b97711beb463e1e71a3bed4a5391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially harmful external content. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=grow+taller+pyramid+secret+stage+11+pdf PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/zesimo.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/bakazozolesakaduxatewakat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607470b0ddeda---91477422734.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf506f3971---24031937583.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65601685840.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/devitukenetoxexugogusejox.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/91598666610.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2235326e8915fbd179d52e40eeb19976/49943712514.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/acbbe9499fdd7fdf0cab7eec6cca479c/36693270823.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/509849.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/23/file/20210723_003653_167.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/32278512184.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/701c496a351de2273db0561dc056d701/rurasigilagurexos.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ss1as3bil41t23as0n9afts5e7/mogexonezokusesad.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/060956215169.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/45320394a4d513fcb44ba9f4c8ed8ef9/rixaviwubokupufulepir.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/722942c8029708c188aada8b979da2e6/welurevaboberejaxugogola.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/17195991766.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/82325763002.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/xukalivuxifobaliligej.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9f57723bc1a85e02cef22ad1e45be764/63365652621.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/tixobumogogivetito.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab1465b3---bujekatapudoxibaxitufu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16356 bytes
SHA-256: 3c7a016d74547bde82b10f902dfabcf3bdd052cdb4607d6d8898227c03756504
font_01_sfnt_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 11152 bytes
SHA-256: 8f01af0e2e2ae1d7fc9c0e30878767fa36203c6deb77b841f92b1f1d9be624f4
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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